Daffodil WMS335 Wireless Optical Mouse - Cordless 3 Button PC Mouse with Scrollwheel and Adjustable Sensitivity (MAX DPI: 2000) - For Laptop/Netbook / Desktop Computers,Red Nano Receiver  Small enough to be left plugged in during transport 2.4GHz Radio Frequency Connection  Reliable operation from up to 10m 2000dpi Optical Sensor  Works on any non transparent surface Adjustable DPI  On the go adjustment of cursor sensitivity for precise control Ergonomic 3 Button Design  Comfortable use for right and left handed operators